Docosahexaenoic acid, especially when combined with eicosapentaenoic acid (EPA), has been studied much more than most dietary supplements and seems to be effective for several uses. Some uses have more scientific evidence in their favor than others.
(Click Does DHA Work? for more information.)
Although good dosing information is available for docosahexaenoic acid plus EPA, there is less information for docosahexaenoic acid alone. The best dosages have not yet been established.
(Click Docosahexaenoic Acid Dosing for more information.)
Docosahexaenoic acid can potentially interact with several medications (see Drug Interactions With Docosahexaenoic Acid).
It is not known exactly what to expect from a docosahexaenoic acid overdose, but it is reasonable to assume that taking too much may cause the usual side effects, but they may perhaps be more severe. Theoretically, taking too much could cause severe problems, such as internal bleeding.
(Click DHA Overdose for more information.)
Refer to the label of your individual docosahexaenoic acid product for information on how to best store it. Keep this and all supplements and medications out of the reach of children.